1<form action="/signup" method="POST">
2  <!-- required: 필수 입력 -->
3  <input type="text" name="name" required>
4
5  <!-- minlength / maxlength: 글자 수 제한 -->
6  <input type="password" name="pw"
7         minlength="8" maxlength="20" required>
8
9  <!-- pattern: 정규식 패턴 매칭 -->
10  <input type="tel" name="phone"
11         pattern="[0-9]{3}-[0-9]{4}-[0-9]{4}"
12         placeholder="010-1234-5678">
13
14  <!-- min / max: 숫자 범위 -->
15  <input type="number" name="age"
16         min="1" max="150">
17
18  <button type="submit">제출</button>
19</form>